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Formation of BaCeO3 and its influence on microstructure of sintered/melt-textured Y-Ba-Cu-O oxides with CeO2 addition

Published online by Cambridge University Press:  03 March 2011

Chan-Joong Kim ,
Ki-Baik Kim ,
Dong-Yeon Won ,
Hong-Chul Moon ,
Dong-Soo Suhr ,
S.H. Lai  and
P.J. McGinn
Chan-Joong Kim
Affiliation:
Superconductivity Research Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daedukdanji, Daejon, 305–606, Korea
Ki-Baik Kim
Affiliation:
Superconductivity Research Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daedukdanji, Daejon, 305–606, Korea
Dong-Yeon Won
Affiliation:
Superconductivity Research Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daedukdanji, Daejon, 305–606, Korea
Hong-Chul Moon
Affiliation:
Department of Materials Science and Engineering, Choongnam National University, Daeduk Science Town, Daejon, 301-764, Korea
Dong-Soo Suhr
Affiliation:
Department of Materials Science and Engineering, Choongnam National University, Daeduk Science Town, Daejon, 301-764, Korea
S.H. Lai
Affiliation:
Center for Materials Science and Engineering, Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
P.J. McGinn
Affiliation:
Center for Materials Science and Engineering, Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556
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Abstract

The formation of BaCeO3 and its effects on microstructure were studied in sintered/melt-textured Y-Ba-Cu-O oxides containing 5 wt. % CeO2 and various amounts of Y2Ba1Cu1O5. The added CeO2 was converted to fine particles of BaCeO3 near 930 °C, which is the conventional sintering temperature for Y-Ba–Cu-O. Y2Ba1Cu1O5 and CuO are formed as by-products of the reaction between CeO2 and Y1Ba2Cu3O7−y phase. The CeO2 addition reduced the particle size of Y2Ba1Cu1O5 which was trapped in the Y1Ba2Cu3O7−y matrix after the melt-texture growth. During the peritectic decomposition stage of Y1Ba2Cu3O7−y phase into Y2Ba1Cu1O5 and liquid phase, the morphology of the decomposed Y2Ba1Cu1O5 was changed from a blocky shape in the undoped sample to an acicular shape of high anisotropy in the CeO2-added sample. The formation of the highly anisotropic Y2Ba1Cu1O5 particles appears to be responsible for the refinement of Y2Ba1Cu1O5 particle after the melt-texture processing.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 8 , August 1994 , pp. 1952 - 1960
Copyright
Copyright © Materials Research Society 1994

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